Synthese 188 (3):449-454 (2012)

Peter Øhrstrøm
Aalborg University
Jörg Zeller
Aalborg University
In his paper, The logic of obligation and the obligations of the logician, A.N. Prior considers Hintikka's theorem, according to which a statement cannot be both impossible and permissible. This theorem has been seen as problematic for the very idea of a logic of obligation. However, Prior rejects the view that the logic of obligation cannot be formalised. He sees this resistance against such a view as an important part of what could be called the obligation of the logician. Prior argues that Hintikka's theorem should not be seen as something paradoxical. On the contrary, it should be seen as a fully acceptable consequence of a basic and reasonable assumption in deontic logic, namely Hintikka's rule
Keywords Obligation  Deontic logic  Hintikka’s theorem
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DOI 10.1007/s11229-011-9936-2
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References found in this work BETA

Formal Logic. Prior - 1955 - Oxford University Press.
Modality and Quantification in S.A. N. Prior - 1956 - Journal of Symbolic Logic 21 (1):60-62.

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